from microbit import *
# program to test out a rotary encoder
# when you rotate the knob the LED display will follow :-)
# Jonathan Hare March 2017
# see www.creative-science.org.uk/bbcmicrobit.html

# port 19 and port 20 for the A and B encoder connections
# port 16 for the encoder push switch connection
# also 0 and +3V to encoder
# note extra pull-up resistors (e.g. 1k) required

# program shows latest value of 'count'
# which can be adjusted using the rotary encoder
# pressing the encoder switch sets the counter to 5

aa = 0
bb = 0
vala = 0
valb = 0
count = 5   
   
while True:   
    aa = pin19.read_digital()
    if aa != vala:
        bb = pin20.read_digital()
        if bb != vala:   
            count = count - 1   
        else:
            count = count + 1
    if count < 0:
       count = 0
    if count >9:
       count = 9    
   
    display.show(str(count))
 
    vala = aa
    valb = bb

    z = pin16.read_digital()
    if z == 0:
       count = 5